CN101799458A - Method for analyzing decomposition products of

By using the invention, the decomposition products such as SO2F2 in Sulfr hexafluoride can be accurately analyzed; and by analyzing the decomposition impurities such as SO2F2, the internal operating condition of...Get price

The decomposition products of sulfur hexafluoride (Sulfr hexafluoride

Nov 01, 2007 · Sulfur hexafluoride (SF 6), molecular weight 146.07, is a colorless, odorless, nonflammable and heavy gas with excellent electrical characteristics that make it applicable for some special uses in the electrical/electronic equipments, industrial processes, scientific fields and commercial products , , . Due to its low toxicity, thermal stability and high breakdown strength, sulfur hexafluoride had various widespread uses as a gaseous dielectric in electrical/electronic system since mid-1970sGet price

The Sulfr hexafluoride Decomposition Mechanism: Background and Significance

Jan 24, 2017 · Comparing all of the detection methods, diagnosing the insulation defect through analyzing the decomposed gases of sf6 gas by chemical gas sensors is the optimal method due to its advantages, such as high detection accuracy and stability, signifying the importance of developing chemical gas sensor used in Sulfr hexafluoride insulated equipment.Get price

(PDF) The Sulfr hexafluoride Decomposition Mechanism: Background and

The result shows that: sf6 gas begins to decompose obviously at 300°C and the main decomposition components contain CO2, SO2F2, SOF2, SOF4, SO2 and H2S; the improvement of fault temperature willGet price

Sulfr hexafluoride gas decomposition analysis under point-to-plane 50 Hz AC

gaz sf6 gas decomposition analysis under point-to-plane 50 Hz AC corona discharge. As one of the most commonly used insulating mediums, in electrical discharge, sulfur hexafluoride (SF<sub6</sub) will decompose in the presence of water vapor and oxygen, producing various gaseous by-products.Get price

Byproducts of Sulfur Hexafluoride (sf 6) Use in the Electric

C Several instances of minor skin irritation from exposure to SF 6 decomposition products have been reported to CIGRE (Mauthe and Pettersson 1991). These instances of human exposure provide useful anecdotal evidence of the possible human health effects due to exposure to SF 6 byproducts, although specific byproduct compounds were not identified inGet price

Analysis of insulating gas byproducts of gas insulated switchgear (220

The decomposition of sulfur hexafluoride (sf 6) in overheated electric equipment at different temperature and humidity was simulated in the study. sf6 gas is significantly decomposed at 350°C.Get price

Adsorption of sf6 gas decomposition gases (H2S, SO2, SOF2 and

Abstract. By detecting the decomposition gases of sulfur hexafluoride (SF 6 ), the type of internal fault of gas insulated switchgear (GIS) can be determined. In this paper, the scandium atom doped molybdenum sulfide material (Sc-MoS 2) was proposed, and the adsorption behaviors of four typical SF 6 decomposing gases (H 2 S, SO 2, SOF 2, SO 2 F 2) on the surfaces of intrinsic MoS 2 and Sc-MoS 2 are studied based on density functional theory (DFT) method.Get price

Handling and Use of Sulfur Hexafluoride Gas

Handling and Use of Sulfur Hexafluoride Gas Page 3 of 8 atmosphere. If discharge of small quantities is necessary for test purposes (i.e., contamination or moisture analysis, etc.), such discharge is to be kept to the minimum required to obtain a reading. B. Decomposition Gasses and Solid By-ProductsGet price

Ultra-Trace Analysis Technique for gaz sf6 Using Gas

SF 6 is a stable, inert, inorganic, colorless, odorless, non-polar and non-toxic gas with a boiling point of −64°C (−58°F) at 100 Pa (1, 11). SF 6 has a vapor pressure of 290 Pa at 21.1°C and a molecular weight of 146.055 g/mol. Compounds with this molecular weight generally exist as liquids. However, the strong bonds between the sulfur and the fluorine atoms create weak intermolecular London dispersion forces, which translate to a low liquefaction temperature thus allowing it toGet price

Effect of Refractory on the Thermal Stability of Sulfr hexafluoride

in sf6 gas decomposition was from 0 percent to 95 percent at 900°C, and the temperatures at which 90-99 percent decomposition oc- curred were lowered by 300-150°C.Get price

Theoretical study of the decomposition mechanism of Sulfr hexafluoride/Cu

Sep 10, 2018 · The compositions of Sulfr hexafluoridearc plasma are contaminated by Cu vapor through electrode erosion and thus affect the performance of the high-voltage insulating gascircuit breaker. But the essential data for chemical kinetic models to study the non-equilibrium compositions of gaz sf6/Cu mixtures, namely the decomposition mechanism of Sulfr hexafluoride/Cu mixtures, is still not clear. Besides, sf 6decomposition products can be used to diagnose insulation faults of GIS and to evaluate the electric life of the sf6 gascircuit breakerGet price

sf 6 Decomposition in Gas-Insulated Equipment - IEEE Journals

In the presence-of an electric arc, spark or corona, gaz sf6 decomposes to a wide variety of chemically active products which possess completely different properties from Sulfr hexafluoride. The accumulation of these decomposition products in the equipment has caused concerns regarding personnel safety and material compatibility problems.Get price

Nanomaterials Based Gas Sensors for Sulfr hexafluoride Decomposition

Diagnosing the insulation defect through analyzing the decomposed gases of insulating gas by chemical gas sensors is the optimal method due to its advantages. Carbon nanotubes, TiO2 nanotubes and graphene are chosen as the gas-sensing materials to build specific gas sensors for detecting each kind of gaz sf6 decomposed gases and then enhance the gasGet price

Decomposing Mechanism of insulating gas under Positive DC Partial

To evaluate PD fault severity in DC SF 6 -insulated equipment using the production characteristics of SF 6 decomposition components, the corresponding relationship and mathematical expression between the production of SF 6 decomposition components and the H 2 O content should be identified and achieved.Get price

DFT Analysis of neutral decomposition by-products in insulating gas-CO2

Molecular orbital properties of decomposition products are examined in order to As a result of different electrical discharges, Sulfr hexafluoride provide information on the insulating properties of eight by- decomposes depending on the energy level in the products’ (COF2, SOF4, SF4, S2F10, S2O2F10, S2OF10, S2O3F6, and environment, the lower fluorides of the sulfur (SF5, SF4, SF3, HF) dielectric strengths are not found in the literature.Get price

CA2504092A1 - Method and device for the detection of sf6

CA2504092A1 - Method and device for the detection of sf6 decomposition products - Google Patents. This invention is in the field of gas detection for sulphur hexafluoride (gaz sf6) gas decomposition products, particularly for the detection of thionyl fluoride (SOF2) and sulphur dioxide (SO2). The invention relates to a novel portable handheld instrument that can readily detect SOF2, SF4 and SO2 in gaz sf6 gas filled electrical equipment and in air.Get price

Sensors | Free Full-Text | Gas Sensing Analysis of Ag

Abstract Detection of decomposition products of sulfur hexafluoride (SF 6) is one of the best ways to diagnose early latent insulation faults in gas-insulated equipment, and the occurrence of sudden accidents can be avoided effectively by finding early latent faults.Get price

Multivariate Evaluation Method for Screening Optimum Gas

In this study, four gas sensors based on metal-oxide semiconductors (WO 3, CeO 2, In 2 O 3, and SnO 2) were used as examples, and their performance in the detection of four decomposition products of sulfur hexafluoride (SF 6) was investigated. After gas-sensing experiments, values for working temperature, response value, and recovery capabilityGet price

Multi - Functional Comprehensive Analysis Sulfr hexafluoride Decomposition

Multi - Functional Comprehensive Analysis Sulfr hexafluoride Decomposition Analyzer Long Service Life. Product description This device can detect and judge the early faults of sf 6 electrical equipment (circuit breaker, transformer, transformer, GIS and casing) quickly and quickly by monitoring two kinds of decomposition of SO2 and H2S at the same time. 1.Get price

gaz sf6 DIAGNOSTICS AND SOLUTIONS — Powertech Labs

Sep 01, 2016 · Powertech can also perform analysis on SF 6 gas for purity (including blend composition), decomposition products, and moisture. In addition, Powertech has the capability for complete on-site chemical analysis using a portable gas chromatograph and/or with Powertech’s decomposition products detector.Get price

Sf6 analyzer - Transdox 3100C insulating gas multigas analyzer

The decomposition products of SF 6 can be identified by analyzing the HF and/or SO 2 content of the gas; this forms from the breakdown of SOF2 and SOF4 after an electrical discharge. The analyzer incorporates two electrochemical, SO 2 and HF sensors to measure ppm levels.Get price

COLLISIONAL DECOMPOSITION OF sf 6- - NIST

Sulfur hexafluoride (SF 6) is widely used as a gaseous dielectric in high-voltage applications due to its extremely large cross section for electron attachment [1,2] and stability with respect to decomposition in subsequent collisions with sf 6 [3]. It is also recognized as a greenhouse gas [4] and it has been suggested that a mixture of SF 6andGet price

Decomposition of insulating gas in an RF Plasma Environment

Decomposition of SF 6 A sensitivity analysis of an earlier model showed that the applied power was the most important parameter and positively affects the decomposition fraction of re-actants in an RF plasma reactor.13 Figure 2 shows that when no oxygen was added to the reactor (feed O 2 /SF 6 ratio = 0.0), η insulating gas clearly increased from 37.79Get price

Myth About sf 6 Gas In Electrical Equipment

Where is Sulfr hexafluoride used? The following applications are known. For some of these most probably you haven’t heard of. For sound insulation in windows, In vehicle tyres, Is sf 6 a health hazard? Pure Sulfr hexafluoride is physiologically completely harmless for humans and animals. It’s even used in medical diagnostic. Due to its weight it might displace the oxygen in the air, if large quantities are concentrating in deeper and non ventilated places. Is gaz sf6 harmful for the environment? It has no ecotoxic potential, it does not deplete ozone. Due to its high global warming potential of 22.200 (*) it may contribute to the man made greenhouse-effect, if it is released into the atmosphere. What is the overall contribution of Sulfr hexafluoride used in the electrical equipment to the greenhouse effect? Less than 0,1 % ( see CAPIEL) and CIGRE). In an Ecofys study the contribution to the greenhouse effect in Europe is estimated to 0.05 % (*).

Optical technology for detecting the decomposition products

M. Piemontesi, R. Pietsch and W. Zaengl, “Analysis of decomposition products of sulfur hexafluoride in negative dc corona with special emphasis on content of H 2 O and O 2,” in Conf. of the IEEE Int. Symp. on Electrical Insulation, 499 –503 (1994).Get price

Decomposition products of sf 6 gas by high‐current arc and

Shotaro Tominaga, Hiroshi Kuwahara, Koichi Hirooka, Takeo Yoshioka, Sulfr hexafluoride Gas Analysis Technique and its Application for Evaluation of Internal Conditions in gaz sf6 Gas Equipment, IEEE Transactions on Power Apparatus and Systems, 10.1109/TPAS.1981.316971, PAS-100, 9, (4196-4206), (1981).Get price

TD710 Revision 9 Handling and Use of Sulfur TD PROCEDURE

Sulfur Hexafluoride Gas is normally supplied in 51” tall cylinders (s/c 0207159) which have a gross weight of approximately 230 lb. and contain a net 115 lb. of gas when full, or 32.5” tall cylinders (s/c 0206835) having a gross weight of approximately 100 lb. and containing a net 38 lb. of gas when full.Get price

A Pt-Doped TiO2 Nanotube Arrays Sensor for Detecting Sulfr hexafluoride

The detection of partial discharge and analysis of SF 6 gas components in gas-insulated switchgear (GIS) is important for the diagnosis and operating state assessment of power equipment. The use of a Pt-doped TiO 2 nanotube arrays sensor for detecting sulfur hexafluoride (SF 6) decomposition products is proposed in this paper. TheGet price